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4 Sheets-Sheet 1. F. H. BOLTE 8: ILG. THEDE.

ROLLER MILL.

Patented Nov. 10, 1885.

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ROLLER MILL. No. 330,288.

Patented Nov. 10, 1885.-

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ROLLER MILL.

No. 330,288. Patented Nov. 10, 1885.

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ROLLER MILL.

No. 330,288. Patented Nov. 10, 1885.

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UNITED STATES PATENT trier,

FRANK H. BOLTE AND HERMAN G. THEDE, OF MILWAUKEE, WISCONSIN, ASSIGNORS OF ONE-THIRD TO JOHN W. THEDE, OF SAME PLACE.

ROLLER-MILL.

SPECIFICATION forming part of Letters Patent No. 330,288, dated November 10, 1885.

Application filed May 31, 1884. Serial No. 133,272. (No model.)

To all whom it may concern.-

Be it known that we, FRANK H. BOLTE and HERMAN G. THEDE, of Milwaukee, in the county of Milwaukee,and in the State of Wisconsin, have invented certain new and useful Improvements in Roller-Mills; and we do hereby declare that the following is a full, clear, and exact description thereof.

Our invention relates to roller-mills; and it consists in certain peculiarities of construction, as will be fully set forth hereinafter, and pointed out in the claims.

In the drawings,Figure lis a side elevation of our improved roller-mill. Fig. 2 is a vertical section on the line a: m of Fig. 3. Fig. 3 is a front elevation of our improved machine, and Fig. l is a detail drawn to an enlarged scale, and partly in section.

A A indicate the mill-frame, on the rear posts of which are firmly bolted the brackets A A. Each of these brackets has bolted on its upper face a saddle, a, through the perforated top of which is passed the threaded lower end of the bifurcated support (6, whereon is suitably mounted an idler, D, the support a being held in place by means of the jam-nuts a a working on its threaded end, and respectively against the upper and lower faces of the saddle-top. This arrangement makes of the supports and the pulleys thereon belt-tighten ers, a few turns of the nuts a a being sufficient to give to the driving-belts d the degree of tension they require. An eccentric, d, is formed close to one of the journaled ends of the idler-shaft D, and around this eccentric is fitted the stirrup (P, the inner end of which is connected to the grain-shaker Dflsuitably supported just below the opening of the hopper O,by means of the arms dipivoted on the bolts (1 to the frame-posts. The inner end of the grain-shaker D hangs in an inclined position inside the casing B, toward the front of the mill, and opposite the inner edge of the fixed cracking-roller E, which latter is j ournaled in stationary bearing-boxes e in the sides of the casing B, and is driven by the large pulley D The other cracking-roller, E, is journaled in horizontallysliding boxes e,suitably mounted in the outer face of the casing, and is driven by the smaller pulley D These rollers may have ridges or corrugations formed around their peripheries, as shown in dottenlines, and may be made of any suitable material. The grinding-roller F is mounted in fixed bearing-boxes fin the sides of the casing, at a suitable distance below the cracking-roller E, and is driven by the large pulley D. The other grinding-roller, F, is journaled in the horizontally-sliding boxesf, and is driven by the smaller pulley B. These rollers are driven in opposite directions, as usual, and at different rates of speed. The sliding motion of the adjustable rollers E and F in a forward direction is practically limited by the adj usting-screws 6 f, the respective inner ends of which simply bear against the socketed front edges of the sliding boxes 6 f,without being connected thereto, the threaded bodies of said screws 6 working in threaded perforations made for them in the swelled portions 9 g of the articulated bars G G, pivoted on the rod g, as hereinafter described.

While the just described construction results in maintaining all the rollers in the desired relative adjustment with respect to each other in the operations of cracking and grinding, the rollers E and F are yet capable of slightly moving still farther forwa.rd,(or away from the fixed rollers E F,) should a small hard substancesuch as a nailfall between the adjacent surfaces of the said adjustable and fixed rollers,by means of the yielding of the springs h on the rods H H,described farther on.

The separation of the rollers for the purpose of adjustment in cracking and grinding is thus effected, first describing the preferred means for separating the cracking-rollers E E; The rear walls of the cases or supports for the sliding boxes 6 are provided with threaded perforations to receive set-screws 6 as shown in Fig. 4, and the said screws may be turned to the desired point, thus serving further as stops to prevent the said rollers comingtogether. For the grindingrollers FF we provide preferably more elaborate adjusting de- 5 of the casing B, and are held in place by means of the adjusting and jam nuts j and j. A

wedge, j, is formed on the lower edge of each of the rods J, and these wedges work between the suitably-beveled ends of the bearing-boxes fand the ends of the studsf formed on the 5 inner ends of the sliding boxes f,and projecting through suitable perforations in the rear .walls of the cases or supports of said boxes, all as shown in Fig. 4. As the adjustingscrewsf are turned so as to to permit of the moving of the adjustable grinding-roller F farther apart from its companion roller F,the lower wedged ends of the rodsJ are depressed between the rollers as far as the increased limit of distance between the boxes f and studs f will permit; and,on the other hand,the said.

rods have to be raised when the adjustingscrews f are turned to decrease said distance.

The articulated bars G G and their connections will next be described. The upper ends of the bars G and the lower ends of the bars G are provided with smooth sleeves g 9 respectively, and through the sleeves g are passed the spring-rods H, while the sleeves receive the spring-rods H. On the forward screwy-threaded ends of these spring-rods H .H are fitted the hand-wheels h, and their opposite ends are passed through suitable perfo-- rations of the rear frame-posts, and eachrod is provided with a head, h, between which and the post a coiled spring, 72 is interposed. On the front of the mill-frame a stud, B,.projects horizontally out from each side of the casing, and each stud is slotted at .b to receive the rod g,snpported therein, and 011 the ends of this rod the articulated bars G G are pivoted, said rod being securely held in position by means of the fastening-nuts g. The extreme ends of the studs B are perforated to receive the journaled ends of the shaft I, to the center of which is keyed the hand-lever 1. Close to each of thejournaled ends of the shaft I is provided a cam, t. The normal position of these cams (which may be keyed to or otherwise fastened on the shaft) is with their spurs or points pressing against the rod which is thus held against the inner edge of each slot 1), as shown in Figs. 1 and 8, which serves to maintain the rollers in the adjustment to which they have been brought; but whenit is desired to separate the rollers for any purpose, as in starting, or when there is a tendency to clogging, or when a hard snbstancesuch as a bolt or bit of metal, or thelikeis accidentally carried in between the adjacent cracking or grinding'surfaces of the rollers, then the lever I is depressed, as shown in Fig. 2, and the cams 73 are thereby turned with their points thrown outward, and this releases therod y, when the force of the springs h h on therods HH serves to draw said rodsto the rear, and with them the upper ends of the bars G Gand thelower. ends of the bars G G, thereby forcing the rod 9 forward against the front edge of each slot [2, and as the adjusting-screws e 6 f are located near those ends of the articulated bars G G which are pivoted on the said rod 9, this action of the said rod will serve to move said pivoted ends of said bars G G bodily forward, thereby carrying said adjusting-screws also forward, inasmuch as the slots 12 are long enough to enable the rod 9 to move the pivoted ends of the bars G G such a distance forward (by the described action of the springs h h as will carry the adjusting-screws c f bodily forward, freeing their inner ends from contact with the sliding boxes 6 f, and permit the adjustable rollers E and F to be separated from their companion rollers E and F (by the action of the hard substance or other material passing through between the rollers) without injury to their cracking or grinding surfaces or derangement of any part of the machinery. The said rollers are not intended to separate in cracking and grinding after being adjusted, except as above stated, and then only. to the limit determined by the position of: the-screws e and f, with thefurther first-described'provision for a slight yielding, to avoid injury from anysmall obstruction, after which the rollers can be again brought back into operative position by raising the lever I again to the position shown in Figs. 1 and 3.

If desired, the upper set of rollerscanbe provided with wedge-rods J; but we find that ordinarily the set-screws 6 will serve the purpose, and by the described arrangement the rollersE and F, can be adjusted independently of each other. i

In order to. prevent the cracked grain from scattering over the grindingmollers, we may employ a vertical hopper, K, to .inclose the space intervening between the crackingand the grinding rollers. This hopper consists of two boards, la la, the edges of which aresuitably beveled, so as to be brought as close to the rollers as possible without comingin. contact with them. and the sides of said boards are suitably fastened in the casing B.

In case at any time the tension of the springs hh should be insufficient, it will be onlynecessary to turn the hand-wheel nuts, h.h,on:the screw-threaded forward ends of the rodsHH, and the difficulty will be at onceremedied.

Having thus described our.invention, wh at we claim as new, and desireto secure by Letters Patent, is.-

1. In a roller-mill, the combination .of an adjustable.cracking-roller and an adjustable grinding -roller, movable sliding bearings wherein said adjustable rollers aremonnted, fixed cracking and grinding rollers,- an articulated spring-frame consisting of jointed bars,

springvrodspassing through the extreme outer justable and fixed cracking and grinding rollrods H H, having hand-wheel nuts h h, I 5 ers, articulated spring-frame consisting of heads h h, and coiled springs h IF, and the jointed bars, spring-rods passing through the adjusting-screws 6 f substantially as shown extreme outer ends of said bars, and carrying and described, and for the purpose set forth. coiled springs upon their rear ends, a horizou- In testimony that We claim the foregoing We tally-moving rod on which said bars are pivothave hereunto set our hands, at Milwaukee, 20

ed, Wedge-shaped bars and set-screw stops, the in the county of Milwaukee and State of Wisslotted casing provided with bearings, a suitcousin, in the presence of two witnesses.

ably-eanirned shaft, and an actuating-lever, T I 10 substantially as and for the purpose set forth. 3. In a roller-mill, the combination of the rollers E E F F, fixed boxes 6 f, sliding boxes Witnesses: e f, and the spring-frames consisting of ar- S. S. STOUT, ticulated bars G G, provided with sleeves g H. G. UNDERWOOD. 

